Display Device and Electronic Apparatus

1. A display device comprising: an image display device for displaying left-eye images and right-eye images alternately; a light-shielding barrier for generating an effect of binocular parallax in images displayed by the image display device, the light-shielding barrier being formed by a liquid crystal panel; and a detection device for detecting a head position of an observer to obtain head position information including: a to-display distance from a head of the observer perpendicular to a surface of the image display device; and a shift distance that the head position moves parallel to the surface of the image display device, wherein the light-shielding barrier having a plurality of barrier portions each includes: an image transmitting portion through which images of the image display device are transmitted; and an image non-transmitting portion through which images are not transmitted, wherein, when the shift distance is E: a distance between the eyes of the observer, 1/2E, or 4/1E, the light-shielding barrier moves a position of the image transmitting portion by ½, ¼, or ⅛ of a light-shielding portion pitch, respectively, the light-shielding portion pitch being defined by an arrangement interval of the image transmitting portion, wherein one pitch of the light-shielding portion pitch includes four pixels in the liquid crystal panel and one of the four pixels forms the image transmitting portion, wherein, when the observer is positioned at a suitable viewing position, only right-eye images of the image display are incident on a right eye after transmitting through a center of each image transmitting portions of the light-shielding barrier, and only left-eye images of the image display are incident on the left eye after transmitting through a center of each transmitting portions of the light-shielding barrier, wherein a suitable viewing distance is the to-display distance at the suitable viewing position, wherein a backward image is an image that is observed by one of the eyes of the observer when the to-display distance is greater than the suitable viewing distance and that includes a crosstalk image, wherein the backward image includes: a right crosstalk image having a right crosstalk central in a center of the right crosstalk image in the horizontal direction; a normal image having a normal central in a center of the normal image in a horizontal direction; and a left crosstalk image having a left crosstalk central in a center of the left crosstalk image in a horizontal direction, and wherein the light-shielding barrier controls a movement amount of the image transmitting portion individually in each of the barrier portions according to positional relations of the left crosstalk central, the normal central, the right crosstalk central, and each of the barrier portions to allow the transmitting portion, which is changed to be observed as the crosstalk image due to a change of the to-display distance, to become the image non-transmitting portion.

2. The display device according to claim 1 , wherein the light-shielding barrier is configured to switch the number of pixels forming the image transmitting portions.

3. An electronic apparatus comprising the display device according to claim 1 .

4. The display device according to claim 1 , wherein the head position information further includes a position of one of right and left eyes of the observer, and wherein the light-shielding barrier moves a position of the image non-transmitting portion based on the position of the one of the right and left eyes of the observer.

5. A display device comprising: an image display device for displaying left-eye images and right-eye images alternately; a light-shielding barrier for generating an effect of binocular parallax in images displayed by the image display device, the light-shielding barrier being formed by a liquid crystal panel; and a detection device for detecting a head position of an observer to obtain head position information including: a to-display distance from a head of the observer perpendicular to a surface of the image display device; and a shift distance that the head position moves parallel to the surface of the image display device, wherein the light-shielding barrier having a plurality of barrier portions each includes: an image transmitting portion through which images of the image display device are transmitted; and an image non-transmitting portion through which images are not transmitted, wherein, when the shift distance is E: a distance between the eyes of the observer, 1/2E, or 4/1E, the light-shielding barrier moves a position of the image transmitting portion by ½, ¼, or ⅛ of a light-shielding portion pitch, respectively, the light-shielding portion pitch being defined by an arrangement interval of the image transmitting portion, wherein one pitch of the light-shielding portion pitch includes eight pixels in the liquid crystal panel and adjacent two or three of the eight pixels form the image transmitting portions, wherein, when the observer is positioned at a suitable viewing position, only right-eye images of the image display are incident on a right eye after transmitting through a center of each image transmitting portions of the light-shielding barrier, and only left-eye images of the image display are incident on the left eye after transmitting through a center of each transmitting portions of the light-shielding barrier, wherein a suitable viewing distance is the to-display distance at the suitable viewing position, wherein a backward image is an image that is observed by one of the eyes of the observer when the to-display distance is greater than the suitable viewing distance and that includes a crosstalk image, wherein the backward image includes: a right crosstalk image having a right crosstalk central in a center of the right crosstalk image in the horizontal direction; a normal image having a normal central in a center of the normal image in a horizontal direction; and a left crosstalk image having a left crosstalk central in a center of the left crosstalk image in a horizontal direction, and wherein the light-shielding barrier controls a movement amount of the image transmitting portion individually in each of the barrier portions according to positional relations of the left crosstalk central, the normal central, the right crosstalk central, and each of the barrier portions to allow the transmitting portion, which is changed to be observed as the crosstalk image due to a change of the to-display distance, to become the image non-transmitting portion.

6. The display device according to claim 5 , wherein the light-shielding barrier is configured to switch the number of pixels forming the image transmitting portions.

7. An electronic apparatus comprising the display device according to claim 5 .

8. The display device according to claim 5 , wherein the head position information further includes a position of one of right and left eyes of the observer, and wherein the light-shielding barrier moves a position of the image non-transmitting portion based on the position of the one of the right and left eyes of the observer.